Half to daniel scull



(No Model.)

N. J. TUBBS. STEAM ENGINE.

No. 428.656. Patented May 27, 1890.

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'UNITED STATES PATENT OFFICE.

NELSON J. TUBES, or PHILADELPHIA, PENNSYLVANIA, ASSIeNoRv or oNE` HALE To DANIEL SoULL, or SAME PLAoE.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 428,656, dated May 27, 1890.

Application led August 23, 1889. Serial No. 321,745. (No model.)

.To all whom it may concern.'

Be it known that I, NELSON J. TU BBS, a citizen of the United States, residing at Philadelphia, in the State of Pennsylvania, have invented a new and useful Improvement in Steam-Engines, of which the following is a specification.

My invention relates to that class of engines known as multiple-cylinder engines;

1c and it consists of certain improvements in the valve and general construction, by which is attained great simplicity of parts and economical operation. secured by my invention being low irst cost Y I5 of engine, efficiency, and durability, provision is made for taking up wear of the parts. In the accompanying drawings, Figure 1 is a vertical longitudinal section through the engine. Fig. 2 isa vertical transverse section zo through the cylinder. Fig. 3 is a detail view of the governor, and Fig. 4t a cross-section through the valve on line A B.

Similar referencesigns refer to similar parts throughout the several views.

The cylinders l are secured to the cored box 2. The cylinders have ports 3,cored out in one side, the continuations of which are l cored in the box 2 and communicate with the valve-chamber 4.. In the cylinders l are the 3o pistons 5, which are provided with packingrings, and are connected to the crank-pin 6 by the rods 7. The pin 6 has an extension 8, and is forged with the shaft 9. The box 2 is secured to the base-plate l0, and has a cover A11 bolted to one side.

inward-projecting base 12, which is bored out to receive the bushing 13, which iits the taper bearing on shaft 9. Wear is taken up in this bearing by means of the studs 14., which pro- 4o ject through the cap 15. The cap 15 is provided with a stuffing-box 16. A suitable pedestal17 is secured to the base-plate l() and forms the other bearing for the shaft 9. The box-casting 2 has a cap 18 to the valve-chamber, through which passes the stem of the valve 20. A stufiing-box 21 is provided to prevent the escape of exhaust-steam to the interior of the box. Steam is admitted through thepipe 22 to the end of the valve 20, the in- 5o terior of said valve being conical in shape. A passage 23 is provided to admit steam to Some of the advantages The cover 1l has anV the ports 3,the steam being cut off from said ports by the edges 24 of the valve as it revolves `in the direction of the arrow in Fig. 4.. On the opposite side of the valve from the passage 23 is the space 25, communicating through the port 26 with the exhaust-passage 27. On the stem of the valve is keyed a toothed segment 28. Loose on the valve-stem is the double arm-piece 29, to which are piv- 6o oted the weighted arms 30 and 31, which are connected by the rod 32. The arm 8O is in the form of a bell-crank, with teeth at 3G, meshing with the toothed segment 2S. Secured to one end of the piece 29 is the spring 34:, which 65 is connected to arm 31 by means of the bolt 35. The valve is opposite and in line with the shaft, and is actuated bythe extension 8 on the crank-pin, which carries the loose arm 29 around Ain exact time with the shaft. The 7o load being constant on the engine, the valve is also rotated in exact time with the shaft; but should the load vary then the weighted arms 3() and 3l, by moving in or out from the center, as a consequence of a variation in 75 speed, change the relative position of the valve with the crank-pin by means of the toothed segments 28 and 36, and therefore change the point of cut-oif.

The crank end of the connecting-rods 7 are 8o provided with taper flanges, over which are secured two rings 36, bored to fit over said flanges and secured together by screws 37, the bosses 3S acting as liners, which can be filed to insure proper Working fit between the connecting-rods and crank-pin. Through one of .the connecting-rods a pin 39 keeps the rings 86 in the same relative position with that rod, preventing the bosses 37 striking the other rods. 9o

It will be seen from the foregoing that I employ a revolving slide-valve in which the steam enters at the center and is distributed to the cylinders in succession. The exhaustport, which is always open, is brought successively to register with the cylinder-ports. My valve is in the center of the engine, in line with the shaft, and from the valve radiate the cylinder-ports. I provide' the engine with an automatic cut-oft by placing the gov- Ioo ernor on the valve stem or spindle and driving the valve from the crank-pin. I have made provision for Wear in the main bearing, and also the crank end of the connectingrods. -Vhen an automatic cut-off is not desirable, I remove the governor and connect the valve-spindle direct with the crank-pin; and should it be desired to use the engine as a Water-motor it is adapted to that purpose by making the valve without lap, in all other respects it remaining the same.

Having fully described the construction and operation of my invention, what I claim as new, and Wish to secure by Letters Patent, is-

I. In a multiple-cylinder engine, a revolving valve inline with the shaft of said engine, in combination with the toothed segment 28, secured to the stern of said valve, and the toothed segment 36 on the Weighted arm 30, said arm 30 and the Weighted arm 3l being pivoted to the piece 29, which is loose or free on the stem of the valve and is connected with the crank-pin of the engine, in substantially the manner described, and for the purpose set forth.

2. In a multiple-cylinder engine, the conibination of the cored box 2, having a valvechainber 4f, and the valve 20, provided with the passage 23 through one side, and the exhaust-port 26, with a shaft and crank-pin, as described, and conneeting-rods having taper bosses and secured to said crank-pin by means of the rings 36, which are provided with liners 38 and screws 37, substantially as described, and for the purpose set forth.

NELSON J. TUBES. Witnesses:

ARTHUR L. STEVENS, FRANK R. STEvENsoN. 

